////////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  Note:
//

using System;
using System.Collections;
using System.Runtime.Remoting;
using System.Runtime.InteropServices;
using System.Threading;
using Microsoft.SingSharp;
using Microsoft.Singularity;
using Microsoft.Singularity.Channels;

#if !SINGULARITY_PROCESS 
namespace Microsoft.Singularity.Directory
#else
namespace Microsoft.Application.DSP
#endif 
{
    public class Path
    {
        ArrayList elts;

        public Path(String! s)
        {
            string[] sa = s.Split("/".ToCharArray());
            ArrayList elts = this.elts = new ArrayList(sa);
            elts.RemoveAt(0); // since paths start with a slash, the first one will be empty
        }

        public bool Empty { get { return this.elts.Count == 0; } }

        public int Length()
        {
            return elts.Count;
        }

        public String StripLast()
        {
            int pos = elts.Count - 1;
            String s = (String)elts[pos];
            elts.RemoveAt(pos);
            return s;
        }

        public void Append(String elt)
        {
            elts.Add(elt);
        }

        public String FirstElement()
        {
            return (String)elts[0];
        }

        public void RemoveFirstElement()
        {
            elts.RemoveAt(0);
        }

        public String! PathString()
        {
            String result = "";
            IEnumerator e = elts.GetEnumerator();
            while (e.MoveNext()) {
                result += "/" + e.Current;
            }
            return result;
        }

        public char[]! in ExHeap PathVector()
        {
            String result = PathString();
            return Bitter.FromString2(result);
        }
    }
}